Western Caliber 4R Silver Digital Hygrometer - Imagine a classic look of a round analog hygrometer but with advanced, accurate digital electronics! The Caliber 4R has legendary accuracy and is designed to eliminate gauge flutter with slow response updating time. It displays humidity and temperature readings on its digital panel and has the ability to record maximum and minimum readings, as well as displaying in either Celsius and Fahrenheit. Accurate to +/- 1% @ 70% RH.